Few equalizers enjoy the respect and admiration of the coveted API 550A. Designed by the now legendary Saul Walker in the late 60's, the discrete 550A was first used as a modular OEM equalizer. As the industry rapidly embraced the sonic quality of the 550A, it quickly found it's way into many custom console designs by Frank DeMedio and other leading engineers. Many of these consoles are still in use today.

The API 550 EQ played a major part in the history of music recording in the USA during the 60's and 70's. Originally conceived for use in API's consoles, this latest 550 "B" version is a continuation of the original 1967 550 through the 550A with one additional filter band and several new frequencies. Incorporating API's exclusive circuitry and proprietary components (such as the legendary API 2520 op-amp), the 550B artfully blends the past with the present. So many hit records still depend on the unique 550 sound, that the 550B will be an invaluable tool you will turn to again and again. The API 550B—unlike any other you will ever use.

Originally conceived for use in API Consoles of the 60's and 70's, the API 560 re-issue is a unique device designed to accomplish tasks that no other EQ can do. It delivers that "one-of-a-kind" API sound, precision easy set filtering, and high headroom in a very small package. Extremely fast to set and reset using accurate zero detents, the curve shaping potential of the 560 is unmatched. At home both in field recording and the studio environment, this "new-old" version is a re-issue of the original 560 with improved resolution in the critical area of ±4 dB. Incorporating API's exclusive circuitry and proprietary components (such as the legendary 2520 op-amp), the re-issue of the 560 artfully blends the past with present—layout with function.

The 1073D (Deluxe) is essentially a 1073 module with extra high frequencies and a direct input for the 500 series market. Built using the same exact parts as the 10 series module, the 1073D features Carnhill transformers, Elma gold plated switches and Canford wire making this the best sounding Class A mic‐pre EQ module on the block.

This is the 500 Series version of the 1073MP (a mic pre-amp version of the 1073 equaliser) having the same well-known characteristic Class A sound with its harmonically rich low end, slight resonant highs, and maintained focused mids.
Two selectable impedances makes the 1073MPL work well with a variety of microphones.
As a coloured and versatile mic-pre, the 1073MPL maintains its sonic signature across a wide bandwidth.

The dbx 520 will help you expertly tame the excessive sibilance often found in vocals and other high frequency dense material. Based upon the legendary dbx 902, the dbx 520’s unique features make it possible to achieve an exact amount of de-essing regardless of variations in signal levels. The 520 allows you to create brilliant, crisp vocals without sibilance!

The Electra combines no fewer than five EQ bands, and features four different filter topologies. This versatile, well-tuned feature set, combined with a clear and punchy tone, makes for a flexible all-round EQ that excels both at sweetening and problem-solving duties.

The new E Series Dynamics Module for 500 Series racks reproduces the legendary sonic signature of an early 80's classic, the SL 4000 E console channel strip, which was featured on countless 1980's recordings. The E Series Dynamics Module features a compressor/limiter and an expander/gate, both of which return faithfully to the circuitry and key components which define the sound of the original SL 611E Series channel strip. A true RMS converter is used in the side chain while the gain element is an all discrete design identical to the Class A VCA chip used in the original unit. The compressor contains additional switching options to defeat the over-easy curve and to use a linear release instead of the more usual logarithmic curve. The result is a compressor with three distinct voices, each with its own musical character.

The E-Series EQ Module for 500 Series racks reproduces the legendary sonic signature of an early 80's classic, the Solid State Logic SL 4000 E console channel strip, which has featured on countless classic recordings from the 1980's to the present. The E-Series EQ Module features two different EQ's found on editions of the console produced between 1981 and 1989. Each EQ has unique response curves and tonal character. Historically the type of EQ fitted in an individual console was distinguished by the colors used on the LF knob caps so the two flavors have become known as the 'Brown' and 'Black' EQ's. On the E Series EQ Module you can switch between these two different flavors of EQ that have been loved by generations of professional producers.

The VHD Pre Module for the popular 500 format modular rack platform makes the uniquely versatile VHD based preamp technology from Duality, SSL's industry leading large format studio console, available for studios of all sizes.

TK Audio’s best-selling 500-series module, the BC501, is a stereo bus compressor that features all the power of TK’s flagship BC1-S. The new BC501 adds some more functions taken from the BC2-ME mastering compressor, such as additional ratio settings (1.25:1, 6:1), a THD switch that adds more even harmonics to the signal, and three HPF settings from which to choose (80Hz, 150Hz, 220Hz). All controls are stepped for easy, precise recall. A dedicated Dry/Comp knob allows blending between the original and compressed signals, and an external sidechain input (accessible via stereo 1/8″ mini TRS jack) is also provided.

TK Audio is entering the 500 series preamp market with the incredibly versatile SP501, a new single slot 500-series class-A unit with a unique hybrid design including both vintage and modern circuits derived from TK’s flagship DP1 stereo preamp. The midrange crunch of the germanium sound of the mid 60’s, the low mid punch and thick sound associated with British Class A from the early 70’s as well as the more modern tone from the 80’s and 90’s are finally all available in a single unit.

The TK-lizer 500 features all the power of the TK Audio’s flagship TK-lizer, including the M/S functionality that has made it such a staple in studios all over the world.
The three bands have a cut/boost range of +/-8dB in 41 steps. The low and high bands can be switched between peak or shelving mode. A high pass filter with a 12dB slope is also provided, and each channel has it’s own level control with a range from infinity to +6dB.
Using the built in M/S function, you can adjust the middle and side signals separately before it is decoded back to a normal L/R signal. In M/S mode you can also adjust the stereo width using the level controls.

The dbx 560A Compressor/Limiter offers legendary VCA-based compression in the increasingly popular 500 Series format. dbx has a much-heralded history with modular processors dating back to our 900 Series and the 560A continues that tradition.